小编Sen*_*hil的帖子

无法从 bytearray 获取 MIME TYPE - 为任何 MIME TYPE 文档返回 NULL。

    byte[] res ={-2,-1,0,114,0,101,0,115,0,117,0,108,0,116,0,13,0,10,0,73,0,32,0,108,0,111,0,118,0,101,0,32,0,73,0,110,0,100,0,105,0,97,0,43,0,52,0,51};
InputStream isr = new BufferedInputStream(new ByteArrayInputStream(res));
String mimeType = URLConnection.guessContentTypeFromStream(isr);
System.out.println(mimeType);